Please give a brief summary of your issue:
PDF Watermark, on off
Please describe your issue and provide steps to reproduce it:
after upload pdf to client(react) and use pdftron web viewer to modify to modify the watermark, the pdf need to be saved on my system again.
if i would like to remove\change the watermark(.net core), how to do that?
is it possible to attach watermark to multiple documents from server only without using pdftron web viewer? if so how to do that?
is it possible to attach watermark to multiple documents from server only without using pdftron web viewer
Yes, definitely, see the Stamper sample.
As for the rest of your questions, I am not quite clear what you are asking.
The best way to proceed is to provide the following information.
Input file(s)
Generated output file(s)
Code and settings used to generate (2) from (1)
Screenshots showing the output, and clearly indicating what you expected to get instead, and also clearly indicating the application/browser being used to view.